sys/net/if_var.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
  35  * $DragonFly: src/sys/net/if_var.h,v 1.71 2008/11/22 04:00:53 sephe Exp $
  36  */
  37
  38 #ifndef _NET_IF_VAR_H_
  39 #define _NET_IF_VAR_H_
  40
  41 #ifndef _SYS_SERIALIZE_H_
  42 #include <sys/serialize.h>
  43 #endif
  44 #ifndef _NET_IF_H_
  45 #include <net/if.h>
  46 #endif
  47
  48 /*
  49  * Structures defining a network interface, providing a packet
  50  * transport mechanism (ala level 0 of the PUP protocols).
  51  *
  52  * Each interface accepts output datagrams of a specified maximum
  53  * length, and provides higher level routines with input datagrams
  54  * received from its medium.
  55  *
  56  * Output occurs when the routine if_output is called, with four parameters:
  57  *      ifp->if_output(ifp, m, dst, rt)
  58  * Here m is the mbuf chain to be sent and dst is the destination address.
  59  * The output routine encapsulates the supplied datagram if necessary,
  60  * and then transmits it on its medium.
  61  *
  62  * On input, each interface unwraps the data received by it, and either
  63  * places it on the input queue of a internetwork datagram routine
  64  * and posts the associated software interrupt, or passes the datagram to
  65  * the routine if_input. It is called with the mbuf chain as parameter:
  66  *      ifp->if_input(ifp, m)
  67  * The input routine removes the protocol dependent header if necessary.
  68  *
  69  * Routines exist for locating interfaces by their addresses
  70  * or for locating a interface on a certain network, as well as more general
  71  * routing and gateway routines maintaining information used to locate
  72  * interfaces.  These routines live in the files if.c and route.c
  73  */
  74
  75 /*
  76  * Forward structure declarations for function prototypes [sic].
  77  */
  78 struct  mbuf;
  79 struct  mbuf_chain;
  80 struct  proc;
  81 struct  rtentry;
  82 struct  rt_addrinfo;
  83 struct  socket;
  84 struct  ether_header;
  85 struct  ucred;
  86 struct  lwkt_serialize;
  87 struct  ifaddr_container;
  88 struct  ifaddr;
  89 struct  lwkt_port;
  90 struct  lwkt_msg;
  91 struct  netmsg;
  92 struct  pktinfo;
  93 struct  ifpoll_info;
  94
  95 #include <sys/queue.h>          /* get TAILQ macros */
  96
  97 #include <net/altq/if_altq.h>
  98
  99 #ifdef _KERNEL
 100 #include <sys/eventhandler.h>
 101 #include <sys/mbuf.h>
 102 #include <sys/systm.h>          /* XXX */
 103 #include <sys/thread2.h>
 104 #endif /* _KERNEL */
 105
 106 #define IF_DUNIT_NONE   -1
 107
 108 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 109 TAILQ_HEAD(ifaddrhead, ifaddr_container); /* instantiation is preserved in the list */
 110 TAILQ_HEAD(ifprefixhead, ifprefix);
 111 LIST_HEAD(ifmultihead, ifmultiaddr);
 112
 113 /*
 114  * Structure defining a queue for a network interface.
 115  */
 116 struct  ifqueue {
 117         struct  mbuf *ifq_head;
 118         struct  mbuf *ifq_tail;
 119         int     ifq_len;
 120         int     ifq_maxlen;
 121         int     ifq_drops;
 122 };
 123
 124 /*
 125  * Note of DEVICE_POLLING
 126  * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this
 127  *    file should include opt_polling.h at its beginning.
 128  * 2) When struct changes, which are conditioned by DEVICE_POLLING,
 129  *    are to be introduced, please keep the struct's size and layout
 130  *    same, no matter whether DEVICE_POLLING is defined or not.
 131  *    See ifnet.if_poll and ifnet.if_poll_unused for example.
 132  */
 133
 134 #ifdef DEVICE_POLLING
 135 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
 136                 POLL_REGISTER };
 137 #endif
 138
 139 enum ifnet_serialize {
 140         IFNET_SERIALIZE_ALL,
 141         IFNET_SERIALIZE_MAIN,
 142         IFNET_SERIALIZE_TX_BASE = 0x10000000,
 143         IFNET_SERIALIZE_RX_BASE = 0x20000000
 144 };
 145 #define IFNET_SERIALIZE_TX      IFNET_SERIALIZE_TX_BASE
 146 #define IFNET_SERIALIZE_RX(i)   (IFNET_SERIALIZE_RX_BASE + (i))
 147
 148 /*
 149  * Structure defining a network interface.
 150  *
 151  * (Would like to call this struct ``if'', but C isn't PL/1.)
 152  */
 153
 154 /*
 155  * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
 156  * one of these structures, typically held within an arpcom structure.
 157  *
 158  *      struct <foo>_softc {
 159  *              struct arpcom {
 160  *                      struct  ifnet ac_if;
 161  *                      ...
 162  *              } <arpcom> ;
 163  *              ...
 164  *      };
 165  *
 166  * The assumption is used in a number of places, including many
 167  * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
 168  *
 169  * Unfortunately devices' softc are opaque, so we depend on this layout
 170  * to locate the struct ifnet from the softc in the generic code.
 171  *
 172  * MPSAFE NOTES:
 173  *
 174  * ifnet is protected by calling if_serialize, if_tryserialize and
 175  * if_deserialize serialize functions with the ifnet_serialize parameter.
 176  * ifnet.if_snd is protected by its own spinlock.  Callers of if_ioctl,
 177  * if_watchdog, if_init, if_resolvemulti, and if_poll should call the
 178  * ifnet serialize functions with IFNET_SERIALIZE_ALL.  Callers of if_start
 179  * sould call the ifnet serialize functions with IFNET_SERIALIZE_TX.
 180  *
 181  * FIXME: Device drivers usually use the same serializer for their interrupt
 182  * FIXME: but this is not required.
 183  *
 184  * Caller of if_output must not serialize ifnet by calling ifnet serialize
 185  * functions; if_output will call the ifnet serialize functions based on
 186  * its own needs.  Caller of if_input does not necessarily hold the related
 187  * serializer.
 188  *
 189  * If a device driver installs the same serializer for its interrupt
 190  * as for ifnet, then the driver only really needs to worry about further
 191  * serialization in timeout based entry points.  All other entry points
 192  * will already be serialized.  Older ISA drivers still using the old
 193  * interrupt infrastructure will have to obtain and release the serializer
 194  * in their interrupt routine themselves.
 195  */
 196 struct ifnet {
 197         void    *if_softc;              /* pointer to driver state */
 198         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 199         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
 200         const char *if_dname;           /* driver name */
 201         int     if_dunit;               /* unit or IF_DUNIT_NONE */
 202         void    *if_vlantrunks;         /* vlan trunks */
 203         struct  ifaddrhead *if_addrheads; /* array[NCPU] of TAILQs of addresses per if */
 204         int     if_pcount;              /* number of promiscuous listeners */
 205         void    *if_carp;               /* carp interfaces */
 206         struct  bpf_if *if_bpf;         /* packet filter structure */
 207         u_short if_index;               /* numeric abbreviation for this if  */
 208         short   if_timer;               /* time 'til if_watchdog called */
 209         int     if_flags;               /* up/down, broadcast, etc. */
 210         int     if_capabilities;        /* interface capabilities */
 211         int     if_capenable;           /* enabled features */
 212         void    *if_linkmib;            /* link-type-specific MIB data */
 213         size_t  if_linkmiblen;          /* length of above data */
 214         struct  if_data if_data;
 215         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 216         int     if_amcount;             /* number of all-multicast requests */
 217 /* procedure handles */
 218         int     (*if_output)            /* output routine (enqueue) */
 219                 (struct ifnet *, struct mbuf *, struct sockaddr *,
 220                      struct rtentry *);
 221         void    (*if_input)             /* input routine from hardware driver */
 222                 (struct ifnet *, struct mbuf *);
 223         void    (*if_start)             /* initiate output routine */
 224                 (struct ifnet *);
 225         int     (*if_ioctl)             /* ioctl routine */
 226                 (struct ifnet *, u_long, caddr_t, struct ucred *);
 227         void    (*if_watchdog)          /* timer routine */
 228                 (struct ifnet *);
 229         void    (*if_init)              /* Init routine */
 230                 (void *);
 231         int     (*if_resolvemulti)      /* validate/resolve multicast */
 232                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
 233         int     (*if_start_cpuid)       /* cpuid to run if_start */
 234                 (struct ifnet *);
 235 #ifdef DEVICE_POLLING
 236         void    (*if_poll)              /* IFF_POLLING support */
 237                 (struct ifnet *, enum poll_cmd, int);
 238         int     if_poll_cpuid;
 239 #else
 240         /* Place holders */
 241         void    (*if_poll_unused)(void);
 242         int     if_poll_cpuid_used;
 243 #endif
 244         void    (*if_serialize)
 245                 (struct ifnet *, enum ifnet_serialize);
 246         void    (*if_deserialize)
 247                 (struct ifnet *, enum ifnet_serialize);
 248         int     (*if_tryserialize)
 249                 (struct ifnet *, enum ifnet_serialize);
 250 #ifdef INVARIANTS
 251         void    (*if_serialize_assert)
 252                 (struct ifnet *, enum ifnet_serialize, boolean_t);
 253 #else
 254         /* Place holders */
 255         void    (*if_serialize_unused)(void);
 256 #endif
 257 #ifdef IFPOLL_ENABLE
 258         void    (*if_qpoll)
 259                 (struct ifnet *, struct ifpoll_info *);
 260 #else
 261         /* Place holders */
 262         void    (*if_qpoll_unused)(void);
 263 #endif
 264         struct  ifaltq if_snd;          /* output queue (includes altq) */
 265         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 266         const uint8_t   *if_broadcastaddr;
 267         void    *if_bridge;             /* bridge glue */
 268         void    *if_afdata[AF_MAX];
 269         struct ifaddr   *if_lladdr;
 270         struct lwkt_serialize *if_serializer;   /* serializer or MP lock */
 271         struct lwkt_serialize if_default_serializer; /* if not supplied */
 272         int     if_cpuid;
 273         struct netmsg *if_start_nmsg; /* percpu messages to schedule if_start */
 274 };
 275 typedef void if_init_f_t (void *);
 276
 277 #define if_mtu          if_data.ifi_mtu
 278 #define if_type         if_data.ifi_type
 279 #define if_physical     if_data.ifi_physical
 280 #define if_addrlen      if_data.ifi_addrlen
 281 #define if_hdrlen       if_data.ifi_hdrlen
 282 #define if_metric       if_data.ifi_metric
 283 #define if_link_state   if_data.ifi_link_state
 284 #define if_baudrate     if_data.ifi_baudrate
 285 #define if_hwassist     if_data.ifi_hwassist
 286 #define if_ipackets     if_data.ifi_ipackets
 287 #define if_ierrors      if_data.ifi_ierrors
 288 #define if_opackets     if_data.ifi_opackets
 289 #define if_oerrors      if_data.ifi_oerrors
 290 #define if_collisions   if_data.ifi_collisions
 291 #define if_ibytes       if_data.ifi_ibytes
 292 #define if_obytes       if_data.ifi_obytes
 293 #define if_imcasts      if_data.ifi_imcasts
 294 #define if_omcasts      if_data.ifi_omcasts
 295 #define if_iqdrops      if_data.ifi_iqdrops
 296 #define if_noproto      if_data.ifi_noproto
 297 #define if_lastchange   if_data.ifi_lastchange
 298 #define if_recvquota    if_data.ifi_recvquota
 299 #define if_xmitquota    if_data.ifi_xmitquota
 300 #define if_rawoutput(if, m, sa) if_output(if, m, sa, NULL)
 301
 302 /* for compatibility with other BSDs */
 303 #define if_list         if_link
 304
 305
 306 /*
 307  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 308  * are queues of messages stored on ifqueue structures
 309  * (defined above).  Entries are added to and deleted from these structures
 310  * by these macros, which should be called with ipl raised to splimp().
 311  */
 312 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 313 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 314 #define IF_QLEN(ifq)            ((ifq)->ifq_len)
 315 #define IF_QEMPTY(ifq)          (IF_QLEN(ifq) == 0)
 316 #define IF_ENQUEUE(ifq, m) do {                                         \
 317         (m)->m_nextpkt = 0;                                             \
 318         if ((ifq)->ifq_tail == 0)                                       \
 319                 (ifq)->ifq_head = m;                                    \
 320         else                                                            \
 321                 (ifq)->ifq_tail->m_nextpkt = m;                         \
 322         (ifq)->ifq_tail = m;                                            \
 323         (ifq)->ifq_len++;                                               \
 324 } while (0)
 325 #define IF_PREPEND(ifq, m) do {                                         \
 326         (m)->m_nextpkt = (ifq)->ifq_head;                               \
 327         if ((ifq)->ifq_tail == 0)                                       \
 328                 (ifq)->ifq_tail = (m);                                  \
 329         (ifq)->ifq_head = (m);                                          \
 330         (ifq)->ifq_len++;                                               \
 331 } while (0)
 332 #define IF_DEQUEUE(ifq, m) do {                                         \
 333         (m) = (ifq)->ifq_head;                                          \
 334         if (m) {                                                        \
 335                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0)            \
 336                         (ifq)->ifq_tail = 0;                            \
 337                 (m)->m_nextpkt = 0;                                     \
 338                 (ifq)->ifq_len--;                                       \
 339         }                                                               \
 340 } while (0)
 341
 342 #define IF_POLL(ifq, m)         ((m) = (ifq)->ifq_head)
 343
 344 #define IF_DRAIN(ifq) do {                                              \
 345         struct mbuf *m;                                                 \
 346         while (1) {                                                     \
 347                 IF_DEQUEUE(ifq, m);                                     \
 348                 if (m == NULL)                                          \
 349                         break;                                          \
 350                 m_freem(m);                                             \
 351         }                                                               \
 352 } while (0)
 353
 354 #ifdef _KERNEL
 355
 356 #ifdef INVARIANTS
 357 #define ASSERT_IFNET_SERIALIZED_ALL(ifp) \
 358         (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_ALL, TRUE)
 359 #define ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp) \
 360         (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_ALL, FALSE)
 361
 362 #define ASSERT_IFNET_SERIALIZED_TX(ifp) \
 363         (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_TX, TRUE)
 364 #define ASSERT_IFNET_NOT_SERIALIZED_TX(ifp) \
 365         (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_TX, FALSE)
 366
 367 #define ASSERT_IFNET_SERIALIZED_MAIN(ifp) \
 368         (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_MAIN, TRUE)
 369 #define ASSERT_IFNET_NOT_SERIALIZED_MAIN(ifp) \
 370         (ifp)->if_serialize_assert((ifp), IFNET_SERIALIZE_MAIN, FALSE)
 371 #else
 372 #define ASSERT_IFNET_SERIALIZED_ALL(ifp)        ((void)0)
 373 #define ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp)    ((void)0)
 374 #define ASSERT_IFNET_SERIALIZED_TX(ifp)         ((void)0)
 375 #define ASSERT_IFNET_NOT_SERIALIZED_TX(ifp)     ((void)0)
 376 #define ASSERT_IFNET_SERIALIZED_MAIN(ifp)       ((void)0)
 377 #define ASSERT_IFNET_NOT_SERIALIZED_MAIN(ifp)   ((void)0)
 378 #endif
 379
 380 static __inline void
 381 ifnet_serialize_all(struct ifnet *_ifp)
 382 {
 383         _ifp->if_serialize(_ifp, IFNET_SERIALIZE_ALL);
 384 }
 385
 386 static __inline void
 387 ifnet_deserialize_all(struct ifnet *_ifp)
 388 {
 389         _ifp->if_deserialize(_ifp, IFNET_SERIALIZE_ALL);
 390 }
 391
 392 static __inline int
 393 ifnet_tryserialize_all(struct ifnet *_ifp)
 394 {
 395         return _ifp->if_tryserialize(_ifp, IFNET_SERIALIZE_ALL);
 396 }
 397
 398 static __inline void
 399 ifnet_serialize_tx(struct ifnet *_ifp)
 400 {
 401         _ifp->if_serialize(_ifp, IFNET_SERIALIZE_TX);
 402 }
 403
 404 static __inline void
 405 ifnet_deserialize_tx(struct ifnet *_ifp)
 406 {
 407         _ifp->if_deserialize(_ifp, IFNET_SERIALIZE_TX);
 408 }
 409
 410 static __inline int
 411 ifnet_tryserialize_tx(struct ifnet *_ifp)
 412 {
 413         return _ifp->if_tryserialize(_ifp, IFNET_SERIALIZE_TX);
 414 }
 415
 416 static __inline void
 417 ifnet_serialize_main(struct ifnet *_ifp)
 418 {
 419         _ifp->if_serialize(_ifp, IFNET_SERIALIZE_MAIN);
 420 }
 421
 422 static __inline void
 423 ifnet_deserialize_main(struct ifnet *_ifp)
 424 {
 425         _ifp->if_deserialize(_ifp, IFNET_SERIALIZE_MAIN);
 426 }
 427
 428 static __inline int
 429 ifnet_tryserialize_main(struct ifnet *_ifp)
 430 {
 431         return _ifp->if_tryserialize(_ifp, IFNET_SERIALIZE_MAIN);
 432 }
 433
 434 /*
 435  * DEPRECATED - should not be used by any new driver.  This code uses the
 436  * old queueing interface and if_start ABI and does not use the ifp's
 437  * serializer.
 438  */
 439 #define IF_HANDOFF(ifq, m, ifp)                 if_handoff(ifq, m, ifp, 0)
 440 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        if_handoff(ifq, m, ifp, adj)
 441
 442 static __inline int
 443 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
 444            int _adjust)
 445 {
 446         int _need_if_start = 0;
 447
 448         crit_enter();
 449
 450         if (IF_QFULL(_ifq)) {
 451                 IF_DROP(_ifq);
 452                 crit_exit();
 453                 m_freem(_m);
 454                 return (0);
 455         }
 456         if (_ifp != NULL) {
 457                 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
 458                 if (_m->m_flags & M_MCAST)
 459                         _ifp->if_omcasts++;
 460                 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
 461         }
 462         IF_ENQUEUE(_ifq, _m);
 463         if (_need_if_start) {
 464                 (*_ifp->if_start)(_ifp);
 465         }
 466         crit_exit();
 467         return (1);
 468 }
 469
 470 /*
 471  * 72 was chosen below because it is the size of a TCP/IP
 472  * header (40) + the minimum mss (32).
 473  */
 474 #define IF_MINMTU       72
 475 #define IF_MAXMTU       65535
 476
 477 #endif /* _KERNEL */
 478
 479 struct in_ifaddr;
 480
 481 struct in_ifaddr_container {
 482         struct in_ifaddr        *ia;
 483         LIST_ENTRY(in_ifaddr_container) ia_hash;
 484                                 /* entry in bucket of inet addresses */
 485         TAILQ_ENTRY(in_ifaddr_container) ia_link;
 486                                 /* list of internet addresses */
 487         struct ifaddr_container *ia_ifac; /* parent ifaddr_container */
 488 };
 489
 490 struct ifaddr_container {
 491 #define IFA_CONTAINER_MAGIC     0x19810219
 492 #define IFA_CONTAINER_DEAD      0xc0dedead
 493         uint32_t                ifa_magic;  /* IFA_CONTAINER_MAGIC */
 494         struct ifaddr           *ifa;
 495         TAILQ_ENTRY(ifaddr_container)   ifa_link;   /* queue macro glue */
 496         u_int                   ifa_refcnt; /* references to this structure */
 497         uint16_t                ifa_listmask;   /* IFA_LIST_ */
 498         uint16_t                ifa_prflags;    /* protocol specific flags */
 499
 500         /*
 501          * Protocol specific states
 502          */
 503         union {
 504                 struct in_ifaddr_container u_in_ifac;
 505         } ifa_proto_u;
 506 };
 507
 508 #define IFA_LIST_IFADDRHEAD     0x01    /* on ifnet.if_addrheads[cpuid] */
 509 #define IFA_LIST_IN_IFADDRHEAD  0x02    /* on in_ifaddrheads[cpuid] */
 510 #define IFA_LIST_IN_IFADDRHASH  0x04    /* on in_ifaddrhashtbls[cpuid] */
 511
 512 #define IFA_PRF_FLAG0           0x01
 513 #define IFA_PRF_FLAG1           0x02
 514 #define IFA_PRF_FLAG2           0x04
 515 #define IFA_PRF_FLAG3           0x08
 516
 517 /*
 518  * The ifaddr structure contains information about one address
 519  * of an interface.  They are maintained by the different address families,
 520  * are allocated and attached when an address is set, and are linked
 521  * together so all addresses for an interface can be located.
 522  */
 523 struct ifaddr {
 524         struct  sockaddr *ifa_addr;     /* address of interface */
 525         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 526 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 527         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 528         struct  if_data if_data;        /* not all members are meaningful */
 529         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 530         void    *ifa_link_pad;
 531         struct ifaddr_container *ifa_containers;
 532         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 533                 (int, struct rtentry *, struct rt_addrinfo *);
 534         u_short ifa_flags;              /* mostly rt_flags for cloning */
 535         int     ifa_ncnt;               /* # of valid ifaddr_container */
 536         int     ifa_metric;             /* cost of going out this interface */
 537 #ifdef notdef
 538         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 539 #endif
 540         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 541                 (struct ifaddr *, struct sockaddr *);
 542
 543 };
 544 #define IFA_ROUTE       RTF_UP          /* route installed */
 545
 546 /* for compatibility with other BSDs */
 547 #define ifa_list        ifa_link
 548
 549 /*
 550  * The prefix structure contains information about one prefix
 551  * of an interface.  They are maintained by the different address families,
 552  * are allocated and attached when an prefix or an address is set,
 553  * and are linked together so all prefixes for an interface can be located.
 554  */
 555 struct ifprefix {
 556         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 557         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 558         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 559         u_char  ifpr_plen;              /* prefix length in bits */
 560         u_char  ifpr_type;              /* protocol dependent prefix type */
 561 };
 562
 563 /*
 564  * Multicast address structure.  This is analogous to the ifaddr
 565  * structure except that it keeps track of multicast addresses.
 566  * Also, the reference count here is a count of requests for this
 567  * address, not a count of pointers to this structure.
 568  */
 569 struct ifmultiaddr {
 570         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 571         struct  sockaddr *ifma_addr;    /* address this membership is for */
 572         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 573         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 574         u_int   ifma_refcount;          /* reference count */
 575         void    *ifma_protospec;        /* protocol-specific state, if any */
 576 };
 577
 578 #ifdef _KERNEL
 579
 580 enum ifaddr_event {
 581         IFADDR_EVENT_ADD,
 582         IFADDR_EVENT_DELETE,
 583         IFADDR_EVENT_CHANGE
 584 };
 585
 586 /* interface address change event */
 587 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *,
 588         enum ifaddr_event, struct ifaddr *);
 589 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
 590 /* new interface attach event */
 591 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
 592 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
 593 /* interface detach event */
 594 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
 595 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
 596
 597 #ifdef INVARIANTS
 598 #define ASSERT_IFAC_VALID(ifac) do { \
 599         KKASSERT((ifac)->ifa_magic == IFA_CONTAINER_MAGIC); \
 600         KKASSERT((ifac)->ifa_refcnt > 0); \
 601 } while (0)
 602 #else
 603 #define ASSERT_IFAC_VALID(ifac) ((void)0)
 604 #endif
 605
 606 static __inline void
 607 _IFAREF(struct ifaddr *_ifa, int _cpu_id)
 608 {
 609         struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
 610
 611         crit_enter();
 612         ASSERT_IFAC_VALID(_ifac);
 613         ++_ifac->ifa_refcnt;
 614         crit_exit();
 615 }
 616
 617 static __inline void
 618 IFAREF(struct ifaddr *_ifa)
 619 {
 620         _IFAREF(_ifa, mycpuid);
 621 }
 622
 623 #include <sys/malloc.h>
 624
 625 MALLOC_DECLARE(M_IFADDR);
 626 MALLOC_DECLARE(M_IFMADDR);
 627
 628 void    ifac_free(struct ifaddr_container *, int);
 629
 630 static __inline void
 631 _IFAFREE(struct ifaddr *_ifa, int _cpu_id)
 632 {
 633         struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
 634
 635         crit_enter();
 636         ASSERT_IFAC_VALID(_ifac);
 637         if (--_ifac->ifa_refcnt == 0)
 638                 ifac_free(_ifac, _cpu_id);
 639         crit_exit();
 640 }
 641
 642 static __inline void
 643 IFAFREE(struct ifaddr *_ifa)
 644 {
 645         _IFAFREE(_ifa, mycpuid);
 646 }
 647
 648 struct lwkt_port *ifnet_portfn(int);
 649 int     ifnet_domsg(struct lwkt_msg *, int);
 650 void    ifnet_sendmsg(struct lwkt_msg *, int);
 651 void    ifnet_forwardmsg(struct lwkt_msg *, int);
 652
 653 static __inline int
 654 ifa_domsg(struct lwkt_msg *_lmsg, int _cpu)
 655 {
 656         return ifnet_domsg(_lmsg, _cpu);
 657 }
 658
 659 static __inline void
 660 ifa_sendmsg(struct lwkt_msg *_lmsg, int _cpu)
 661 {
 662         ifnet_sendmsg(_lmsg, _cpu);
 663 }
 664
 665 static __inline void
 666 ifa_forwardmsg(struct lwkt_msg *_lmsg, int _nextcpu)
 667 {
 668         ifnet_forwardmsg(_lmsg, _nextcpu);
 669 }
 670
 671 extern  struct ifnethead ifnet;
 672 extern struct   ifnet   **ifindex2ifnet;
 673 extern  int ifqmaxlen;
 674 extern  struct ifnet loif[];
 675 extern  int if_index;
 676
 677 void    ether_ifattach(struct ifnet *, uint8_t *, struct lwkt_serialize *);
 678 void    ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int,
 679                         struct lwkt_serialize *);
 680 void    ether_ifdetach(struct ifnet *);
 681 void    ether_demux_oncpu(struct ifnet *, struct mbuf *);
 682 void    ether_input_oncpu(struct ifnet *, struct mbuf *);
 683 void    ether_reinput_oncpu(struct ifnet *, struct mbuf *, int);
 684 void    ether_input_chain(struct ifnet *, struct mbuf *,
 685                           const struct pktinfo *, struct mbuf_chain *);
 686 void    ether_input_chain_init(struct mbuf_chain *);
 687 void    ether_input_dispatch(struct mbuf_chain *);
 688 int     ether_output_frame(struct ifnet *, struct mbuf *);
 689 int     ether_ioctl(struct ifnet *, int, caddr_t);
 690 uint32_t        ether_crc32_le(const uint8_t *, size_t);
 691 uint32_t        ether_crc32_be(const uint8_t *, size_t);
 692
 693 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
 694 int     if_allmulti(struct ifnet *, int);
 695 void    if_attach(struct ifnet *, struct lwkt_serialize *);
 696 int     if_delmulti(struct ifnet *, struct sockaddr *);
 697 void    if_purgeaddrs_nolink(struct ifnet *);
 698 void    if_detach(struct ifnet *);
 699 void    if_down(struct ifnet *);
 700 void    if_link_state_change(struct ifnet *);
 701 void    if_initname(struct ifnet *, const char *, int);
 702 int     if_getanyethermac(uint16_t *, int);
 703 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 704 void    if_route(struct ifnet *, int flag, int fam);
 705 int     if_setlladdr(struct ifnet *, const u_char *, int);
 706 void    if_unroute(struct ifnet *, int flag, int fam);
 707 void    if_up(struct ifnet *);
 708 /*void  ifinit(void);*/ /* declared in systm.h for main() */
 709 int     ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
 710 int     ifpromisc(struct ifnet *, int);
 711 struct  ifnet *ifunit(const char *);
 712 struct  ifnet *if_withname(struct sockaddr *);
 713
 714 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
 715 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
 716 struct  ifaddr *ifa_ifwithnet(struct sockaddr *);
 717 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
 718 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 719
 720 void    *ifa_create(int, int);
 721 void    ifa_destroy(struct ifaddr *);
 722 void    ifa_iflink(struct ifaddr *, struct ifnet *, int);
 723 void    ifa_ifunlink(struct ifaddr *, struct ifnet *);
 724
 725 struct  ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 726 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
 727 void    if_devstart(struct ifnet *ifp);
 728
 729 #define IF_LLSOCKADDR(ifp)                                              \
 730     ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
 731 #define IF_LLADDR(ifp)  LLADDR(IF_LLSOCKADDR(ifp))
 732
 733 #ifdef DEVICE_POLLING
 734 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
 735 int     ether_poll_register(struct ifnet *);
 736 int     ether_poll_deregister(struct ifnet *);
 737 int     ether_pollcpu_register(struct ifnet *, int);
 738 #endif /* DEVICE_POLLING */
 739
 740 #ifdef IFPOLL_ENABLE
 741 int     ifpoll_register(struct ifnet *);
 742 int     ifpoll_deregister(struct ifnet *);
 743 #endif  /* IFPOLL_ENABLE */
 744
 745 #endif /* _KERNEL */
 746
 747 #endif /* !_NET_IF_VAR_H_ */